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Method and apparatus for link adaptation in precoded MIMO systems

a technology of mimo and link adaptation, applied in the field of link adaptation, can solve the problems of delay in the estimation process, inability to adapt, and variable channel fading

Inactive Publication Date: 2015-04-23
NEC (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method and apparatus for link adaptation in a precoded MIMO system. The technical effects of the invention include improved link adaptation for multiple layers in a MIMO system, as well as adjustments to the HARQ scaling factor based on single-layer or multi-layer HARQ feedback. These improvements can lead to improved performance and reliability of the MIMO system.

Problems solved by technology

Meanwhile, channel fading may be variable over time of the instantaneous conditions of the wireless communication channel.
In practice, the UE may be able to directly determine the instantaneous channel conditions of the channel, but the BS is not able to do so.
Although it has provided a method of estimating quality in an individual layer of a plurality of layers, delay is introduced in the estimating process.
Therefore, those methods and apparatuses cannot provide post-equalization SINR when eigen-based TM8 (Transmission Mode 8) is used in LTE TDD system.

Method used

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  • Method and apparatus for link adaptation in precoded MIMO systems
  • Method and apparatus for link adaptation in precoded MIMO systems
  • Method and apparatus for link adaptation in precoded MIMO systems

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Embodiment Construction

[0023]Various embodiments of the present invention are described in detail with reference to the drawings. The flowcharts and block diagrams in the figures illustrate the apparatus, method, as well as architecture, functions and operations executable by a computer program product according to the embodiments of the present invention. In this regard, each block in the flowcharts or block diagram may represent a module, a program, or a part of code, which contains one or more executable instructions for performing specified logic functions. It should be noted that in some alternatives, functions indicated in blocks may occur in an order differing from the order as illustrated in the figures. For example, two blocks illustrated consecutively may be actually performed in parallel substantially or in an inverse order, which depends on related functions. It should also be noted that block diagrams and / or each block in the flowcharts and a combination of thereof may be implemented by a ded...

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Abstract

Embodiments of the invention relate to methods and apparatus for link adaptation in a preceded MIMO system. According to one embodiment, there is provided a method for link adaptation in a precoded MIMO system. The method comprises: receiving first channel quality information γCQI; with respect to at least one layer r in a plurality of layers in a link; obtaining a Hybrid Automatic Repeat Request (HARQ) scaling factor μr that is associated with a HARQ feedback; and interpreting the first channel quality information γCQI into second channel quality information {circumflex over (γ)}r based on at least the HARQ scaling factor μr, wherein the second channel quality information {circumflex over (γ)}r is for adapting the at least one layer r in the plurality of layers. According to another embodiment, there is provided an apparatus for link adaptation in a precoded MIMO system.

Description

FIELD OF THE INVENTION[0001]Embodiments of the present invention generally relate to link adaptation. More particularly, embodiments of the present invention relate to methods and apparatuses for link adaptation in a precoded multiple-input multiple-output (MIMO) system.BACKGROUND OF THE INVENTION[0002]In the technical field of wireless communication, channel fading is a fundamental characteristic of a wireless communication channel. Meanwhile, channel fading may be variable over time of the instantaneous conditions of the wireless communication channel. Channel-dependent adaptation of a transmission is one way to handle channel fading. When a channel is in a good state, it is possible to transmit data using a low level of error protection on the channel. In contrast, when the channel is in a bad fading state, a higher level of error protection is necessary, which causes a reduction in the information data rate. The level of error protection may, for example, be varied by changing t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L1/18H04B7/04
CPCH04B7/0413H04L1/1861H04L1/0015H04L1/0025H04L1/0034H04L1/0035H04B7/0417H04B7/0452H04B7/0632
Inventor ZHANG, YUSUN, ZHENNIANWANG, GANGLEI, MING
Owner NEC (CHINA) CO LTD
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